﻿using System;
using System.Drawing;
using System.IO;
using System.Text.RegularExpressions;
using System.Web;

namespace Management.Auxiliary
{
    public class Uploader
    {
        /// <summary>
        /// 上传
        /// </summary>
        /// <param name="sFilename"></param>
        /// <param name="uploadFileBytes"></param>
        /// <param name="OriOrThumb">0-原图，1-缩略图</param>
        /// <returns></returns>
        public string UploadThumb(string sFilename, byte[] uploadFileBytes, int OriOrThumb)
        {
            string _path = OriOrThumb == 0 ? "~/Content/Images/upload/head/{yyyy}{mm}{dd}/{time}{rand:6}" : "~/Content/Images/upload/head/thumb/{yyyy}{mm}{dd}/{time}{rand:6}";
            var savePath = PathFormatter(sFilename, _path);
            var localPath = System.Web.HttpContext.Current.Server.MapPath(savePath);
            if (OriOrThumb == 0)
            {
                try
                {
                    if (!Directory.Exists(Path.GetDirectoryName(localPath)))
                    {
                        Directory.CreateDirectory(Path.GetDirectoryName(localPath));
                    }
                    System.IO.File.WriteAllBytes(localPath, uploadFileBytes);
                }
                catch
                {
                    return "error";
                }
            }

            return savePath;
        }


        /// <summary> 
        /// 生成缩略图 
        /// </summary> 
        /// <param name="originalImagePath">源图路径</param> 
        /// <param name="thumbnailPath">缩略图路径</param> 
        /// <param name="width">缩略图宽度</param> 
        /// <param name="height">缩略图高度</param> 
        /// <param name="mode">生成缩略图的方式</param>     
        public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
        {
            originalImagePath = System.Web.HttpContext.Current.Server.MapPath(originalImagePath);
            thumbnailPath = System.Web.HttpContext.Current.Server.MapPath(thumbnailPath);
            System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
            int towidth = width;
            int toheight = height;
            int x = 0;
            int y = 0;
            int ow = originalImage.Width;
            int oh = originalImage.Height;
            switch (mode)
            {
                case "HW"://指定高宽缩放（可能变形）                 
                    break;
                case "W"://指定宽，高按比例                     
                    toheight = originalImage.Height * width / originalImage.Width;
                    break;
                case "H"://指定高，宽按比例 
                    towidth = originalImage.Width * height / originalImage.Height;
                    break;
                case "Cut"://指定高宽裁减（不变形）                 
                    if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                    {
                        oh = originalImage.Height;
                        ow = originalImage.Height * towidth / toheight;
                        y = 0;
                        x = (originalImage.Width - ow) / 2;
                    }
                    else
                    {
                        ow = originalImage.Width;
                        oh = originalImage.Width * height / towidth;
                        x = 0;
                        y = (originalImage.Height - oh) / 2;
                    }
                    break;
                default:
                    break;
            }

            //新建一个bmp图片 
            System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);

            //新建一个画板 
            Graphics g = System.Drawing.Graphics.FromImage(bitmap);

            //设置高质量插值法 
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

            //设置高质量,低速度呈现平滑程度 
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            //清空画布并以透明背景色填充 
            g.Clear(Color.Transparent);

            //在指定位置并且按指定大小绘制原图片的指定部分 
            g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
                new Rectangle(x, y, ow, oh),
                GraphicsUnit.Pixel);

            try
            {
                if (!Directory.Exists(Path.GetDirectoryName(thumbnailPath)))
                {
                    Directory.CreateDirectory(Path.GetDirectoryName(thumbnailPath));
                }
                //以jpg格式保存缩略图 
                bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
            }
            catch
            {
                throw;
            }
            finally
            {
                originalImage.Dispose();
                bitmap.Dispose();
                g.Dispose();
            }
        }


        public string PathFormatter(string originFileName, string pathFormat)
        {
            if (String.IsNullOrWhiteSpace(pathFormat))
            {
                pathFormat = "{filename}{rand:6}";
            }

            var invalidPattern = new Regex(@"[\\\/\:\*\?\042\<\>\|]");
            originFileName = invalidPattern.Replace(originFileName, "");

            string extension = Path.GetExtension(originFileName);
            string filename = Path.GetFileNameWithoutExtension(originFileName);

            pathFormat = pathFormat.Replace("{filename}", filename);
            pathFormat = new Regex(@"\{rand(\:?)(\d+)\}", RegexOptions.Compiled).Replace(pathFormat, new MatchEvaluator(delegate(Match match)
            {
                var digit = 6;
                if (match.Groups.Count > 2)
                {
                    digit = int.Parse(match.Groups[2].Value);
                }
                var rand = new Random();
                return rand.Next((int)Math.Pow(10, digit), (int)Math.Pow(10, digit + 1)).ToString();
            }));

            pathFormat = pathFormat.Replace("{time}", DateTime.Now.Ticks.ToString());
            pathFormat = pathFormat.Replace("{yyyy}", DateTime.Now.Year.ToString());
            pathFormat = pathFormat.Replace("{yy}", (DateTime.Now.Year % 100).ToString("D2"));
            pathFormat = pathFormat.Replace("{mm}", DateTime.Now.Month.ToString("D2"));
            pathFormat = pathFormat.Replace("{dd}", DateTime.Now.Day.ToString("D2"));
            pathFormat = pathFormat.Replace("{hh}", DateTime.Now.Hour.ToString("D2"));
            pathFormat = pathFormat.Replace("{ii}", DateTime.Now.Minute.ToString("D2"));
            pathFormat = pathFormat.Replace("{ss}", DateTime.Now.Second.ToString("D2"));

            return pathFormat + extension;
        }
    }
}
